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Conferences

Design and Fabrication of Multijunction Thermal Converters at NIST and Sandia National Laboratories

November 18, 2002

Author(s)

Joseph R. Kinard Jr., Thomas E. Lipe Jr., Thomas F. Wunsch, Ronald R. Manginell

The National Institute of Standards and Technology (NIST) and the Sandia National Laboratories (SNL) are collaborating on the design and fabrication of thin...

Calibration of Nonreciprocal Radar Systems

November 14, 2002

Author(s)

Lorant A. Muth

The calibration of nonreciprocal radars has been studied extensively. Here we present a robust calibration procedure using Fourier analysis of back-scatter data...

Calibrating Photoreceiver Response to 110 GHz

November 13, 2002

Author(s)

Tracy S. Clement, Dylan F. Williams, Paul D. Hale, Juanita M. Morgan

We have measured the magnitude and phase responses of a photoreceiver to 110 GHz using a calibrated electro-optic sampling system. The frequency range of the...

Ex-situ Characterization of InGaAsP

November 11, 2002

Author(s)

Alexana Roshko, Kristine A. Bertness

An interlaboratory comparison was undertaken to assess differences in X-ray and photoluminescence measurements from different laboratories. Six InGaAsP...

Composition standards for III-V semiconductor epitaxial films

November 11, 2002

Author(s)

Kristine A. Bertness, Lawrence H. Robins, J T. Armstrong, Ryna B. Marinenko, Albert J. Paul, Marc L. Salit

A program is underway at NIST to establish standard reference materials (SRMs) for the calibration of instruments used to measure the chemical composition of...

Trace water detection in semiconductor-grade phosphine gas

November 11, 2002

Author(s)

Kristine A. Bertness, Susan Y. Lehman, Joseph T. Hodges, H. H. Funke, Mark W. Raynor

We are applying cavity ring-down spectroscopy (CRDS) to measure water concentrations in nitrogen and, for the first time to our knowledge, in phosphine...

Ultra-Wideband TEM-Horn Antenna Design using Numerical Methods

November 8, 2002

Author(s)

Chriss A. Grosvenor, David R. Novotny, Jason Veneman, Seturnino Canales

TEM, time-domain antennas are designed to reproduce accurately the time characteristics of an impulsive, incoming field. The response to the fields must be...

Spherical Scanning Measurements Using Truncated Data Sets

November 8, 2002

Author(s)

Ronald C. Wittmann, Carl F. Stubenrauch, Michael H. Francis

We discuss the mitigation of truncation errors in spherical scanning measurement. The main emphasis is the spherical harmonic representation of probe...

Ultra-Wideband Antenna Pattern Characterization in a Non-Ideal EM Facility

November 8, 2002

Author(s)

Jason Veneman, David R. Novotny, Chriss A. Grosvenor, Robert T. Johnk, Seturnino Canales

We present and analyze a procedure for performing relative, ultra-wideband antenna pattern measurements in a non-ideal EM facility. Ultra-wideband, short...

Methods to Estimate and Reduce Leakage Bias Errors in Planar Near-Field Measurements

November 8, 2002

Author(s)

Allen C. Newell, Jeffrey R. Guerrieri, Katherine MacReynolds

This paper describes two methods that can be used to measure the leakage signals, predict the effect on the far-field pattern and correct the measured data for...

Spherical Near-Field Antenna Measurements Using Nonideal Measurement Locations

November 8, 2002

Author(s)

Ronald C. Wittmann, Bradley Alpert, Michael H. Francis

We introduce a near-field spherical scanning algorithm that relaxes the usual condition requiring data points to be on a regular spherical grid. Computational...

Analysis of Phase-Dependent RCS Measurements

November 8, 2002

Author(s)

Lorant A. Muth, Timothy Conn

Free space coherent radar cross section measurements on a moving target will trace a circle centered on the origin of the complex (I,Q) plane. Noise will...

Simulation of SCC Flow

November 1, 2002

Author(s)

Nicos Martys, Chiara F. Ferraris

Predicting the rheological properties of concrete is essential for its optimal use in situations such as flow between rebars. The aggregate gradation and shape...

Time-Dependent Wind Effects: Database-Assisted Design and Estimation of Ultimate Limit States for Rigid and Flexible Structures

November 1, 2002

Author(s)

Fahim Sadek, Emil Simiu, S Jong, L W. Lu

We describe the database-assisted design approach for wind loading, and its application for estimating limit states including ultimate limit states for low-rise...

Surface and Interface Properties of PVDF/Acrylic Copolymer Blends

November 1, 2002

Author(s)

Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D Nguyen

Poly(vinylidene fluoride) (PVDF) is commonly blended with amorphous polymers to improve its optical property. The surface and interface properties of PVDF...

Polymer-Filled Calcium Phosphate Cement: Mechanical Properties and Controlled Release of Growth Factor

November 1, 2002

Author(s)

Francis W. Wang, C A. Khatri, J F. Hsii

Calcium phosphate cement (CPC) was improved by incorporating porogens to induce macropores and proteins to stimulate bone growth. A paste was made from CPC...

Measurement of the 100 nm NIST SRM 1963 by Laser Surface Light Scattering

November 1, 2002

Author(s)

Thomas A. Germer, George W. Mulholland, Jae Hyun Kim, S H. Ehrman

Accurate sizing of particles deposited on surfaces is important for the semiconductor, optical, and data storage industries. The recent availability of accurate...

Database-Assisted Design and Wind Directionality Effects

November 1, 2002

Author(s)

A Rigato, P C. Chang, Emil Simiu

We present a simple methodology, developed for use in design assisted by electronic aerodynamic and climatological databases (for short, database-assisted...

The Effects of Local Inhomogeneity on Shear Property Measurements of Hybrid Composites

November 1, 2002

Author(s)

Martin Chiang, Carl R. Schultesiz, J He

Numerous biological and chemical studies involve the use of calcium hydroxyapatite Ca10(PO4)6(OH)2, HA. In this study detailed physicochemical characterization...

NIST's Assessment of Text Independent Speaker Recognition Performance

November 1, 2002

Author(s)

Mark A. Przybocki, Alvin F. Martin

NIST has coordinated annual evaluations of text-independent speaker recognition since 1996. These evaluations aim to provide important contributions to the...

Fluorescence Enhancement in Non-Contact and Dynamic-Force Apertureless Near-Field Scanning Optical Microscopy

November 1, 2002

Author(s)

V V. Protasenko, Alan Gallagher, David Nesbitt

The fluorescence of single ZnS overcoated CdSe Quantum dots (QDS) and dye doped polystyrene spheres (PSs) embedded in the evanescent optical field has been...

Study on Isochoric Specific Heat Capacities for Liquid Methanol-Water Mixtures

November 1, 2002

Author(s)

Hiroshi Kitajima, Hiroyuki Miyamoto, Noboru Kagawa, Joe W. Magee, Harumi Endo, Seizo Tsuruno, Koichi Watanabe

Hydrogen bonding of water (H 2O) is certain to introduce an effect of the molecular energy to the heat capacity. Due to the presence of the strong hydrogen...

Measurements and Simulations of Noise Imposed on Supercontinuum Generated in Microstructure Fiber

November 1, 2002

Author(s)

Nathan R. Newbury, Kristan L. Corwin, J M. Dudley, S. Coen, Scott Diddams, K Weber, R Windeler

We present experimental and theoretical investigations of the highly nonlinear and broadband noise that exists on supercontinuum spectra generated from...

Knowledge Engineering for Real Time Control

October 30, 2002

Author(s)

John Evans, Elena R. Messina, James S. Albus, Craig I. Schlenoff

The key to real-time intelligent control lies in the knowledge models that the system contains. Three main classes of knowledge are identified: parametric...

Towards a Formal Representation of Driving Behaviors

October 28, 2002

Author(s)

Craig I. Schlenoff, Michael Gruninger

To successfully perform their required tasks, intelligent information agents require accurate and meaningful communication and integration among other agents...

Thermal Component Models for Electro-Thermal Analysis of Multichip Power Modules

October 24, 2002

Author(s)

J J. Rodriguez, John V. Reichl, Zharadeen R. Parrilla, Allen R. Hefner Jr., David W. Berning, M Velez-Reyes, Jih-Sheng Lai

Thermal component models are developed for multi-chip IGBT power electronic modules (PEM) and associated high-power converter heatsinks. The models are...

Testing with Model Checkers: Insuring Fault Visibility

October 23, 2002

Author(s)

Vadim Okun, Paul E. Black, Y Yesha

To detect a fault in software, a test case execution must be chosen so intermediate errors propagate to the output. We describe two modeling methods for...

Negative Bias Temperature Instability of Deep Sub-Micron p-MOSFETs Under Pulsed Bias Stress

October 21, 2002

Author(s)

Baozhong Zhu, John S. Suehle, Y Chen, J B. Bernstein

Negative bias temperature instability (NBTI) and Positive bias temperature instability (PBTI) of p-MOSFETs with 2.4 nm thick oxide films were studied. The Δ}Vth...

Defect Generation in Ultra-thin Oxide Over Large Fluence Range

October 21, 2002

Author(s)

Da-Wei Heh, Eric M. Vogel, J B. Bernstein

The defect generation rate (P g) during constant voltage stress is investigated by using short-time voltage pulses over large fluence range. It is found that P...

Embedded Real-Time Linux for Cable Robot Control

October 2, 2002

Author(s)

Frederick M. Proctor, William P. Shackleford

Linux is a version of the Unix operating system distributed according to the open source model. Programmers are free to adapt the source code for their purposes...

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